This will allow a reporter to decide how to handle the results of
each item. It can use the common plain text formatter (as has been
the case, '_formatItemReport') or it may generate a report itself.
This will be useful for the MySQL reporter where it will want to
create an entry in a table for each build.
Action reporters are now configured with the action type, so they can
react differently for the success, failure, etc.
Co-Authored-By: Jan Hruban <jan.hruban@gooddata.com>
Change-Id: Ib270334ff694fdff69a3028db8d6d7fed1f05176
385d11e2ed